summaryrefslogtreecommitdiff
path: root/include/linux/dma-direct.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/dma-direct.h')
-rw-r--r--include/linux/dma-direct.h92
1 files changed, 69 insertions, 23 deletions
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 2b045c509146..5a3ce2a24794 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -1,10 +1,16 @@
/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Internals of the DMA direct mapping implementation. Only for use by the
+ * DMA mapping code and IOMMU drivers.
+ */
#ifndef _LINUX_DMA_DIRECT_H
#define _LINUX_DMA_DIRECT_H 1
#include <linux/dma-mapping.h>
+#include <linux/dma-noncoherent.h>
#include <linux/memblock.h> /* for min_low_pfn */
#include <linux/mem_encrypt.h>
+#include <linux/swiotlb.h>
extern unsigned int zone_dma_bits;
@@ -87,25 +93,17 @@ int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma,
unsigned long attrs);
int dma_direct_supported(struct device *dev, u64 mask);
bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr);
-dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
- unsigned long offset, size_t size, enum dma_data_direction dir,
- unsigned long attrs);
int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
enum dma_data_direction dir, unsigned long attrs);
dma_addr_t dma_direct_map_resource(struct device *dev, phys_addr_t paddr,
size_t size, enum dma_data_direction dir, unsigned long attrs);
+size_t dma_direct_max_mapping_size(struct device *dev);
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \
defined(CONFIG_SWIOTLB)
-void dma_direct_sync_single_for_device(struct device *dev,
- dma_addr_t addr, size_t size, enum dma_data_direction dir);
-void dma_direct_sync_sg_for_device(struct device *dev,
- struct scatterlist *sgl, int nents, enum dma_data_direction dir);
+void dma_direct_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,
+ int nents, enum dma_data_direction dir);
#else
-static inline void dma_direct_sync_single_for_device(struct device *dev,
- dma_addr_t addr, size_t size, enum dma_data_direction dir)
-{
-}
static inline void dma_direct_sync_sg_for_device(struct device *dev,
struct scatterlist *sgl, int nents, enum dma_data_direction dir)
{
@@ -115,34 +113,82 @@ static inline void dma_direct_sync_sg_for_device(struct device *dev,
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \
defined(CONFIG_SWIOTLB)
-void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
- size_t size, enum dma_data_direction dir, unsigned long attrs);
void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl,
int nents, enum dma_data_direction dir, unsigned long attrs);
-void dma_direct_sync_single_for_cpu(struct device *dev,
- dma_addr_t addr, size_t size, enum dma_data_direction dir);
void dma_direct_sync_sg_for_cpu(struct device *dev,
struct scatterlist *sgl, int nents, enum dma_data_direction dir);
#else
-static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
- size_t size, enum dma_data_direction dir, unsigned long attrs)
-{
-}
static inline void dma_direct_unmap_sg(struct device *dev,
struct scatterlist *sgl, int nents, enum dma_data_direction dir,
unsigned long attrs)
{
}
+static inline void dma_direct_sync_sg_for_cpu(struct device *dev,
+ struct scatterlist *sgl, int nents, enum dma_data_direction dir)
+{
+}
+#endif
+
+static inline void dma_direct_sync_single_for_device(struct device *dev,
+ dma_addr_t addr, size_t size, enum dma_data_direction dir)
+{
+ phys_addr_t paddr = dma_to_phys(dev, addr);
+
+ if (unlikely(is_swiotlb_buffer(paddr)))
+ swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_DEVICE);
+
+ if (!dev_is_dma_coherent(dev))
+ arch_sync_dma_for_device(paddr, size, dir);
+}
+
static inline void dma_direct_sync_single_for_cpu(struct device *dev,
dma_addr_t addr, size_t size, enum dma_data_direction dir)
{
+ phys_addr_t paddr = dma_to_phys(dev, addr);
+
+ if (!dev_is_dma_coherent(dev)) {
+ arch_sync_dma_for_cpu(paddr, size, dir);
+ arch_sync_dma_for_cpu_all();
+ }
+
+ if (unlikely(is_swiotlb_buffer(paddr)))
+ swiotlb_tbl_sync_single(dev, paddr, size, dir, SYNC_FOR_CPU);
}
-static inline void dma_direct_sync_sg_for_cpu(struct device *dev,
- struct scatterlist *sgl, int nents, enum dma_data_direction dir)
+
+static inline dma_addr_t dma_direct_map_page(struct device *dev,
+ struct page *page, unsigned long offset, size_t size,
+ enum dma_data_direction dir, unsigned long attrs)
{
+ phys_addr_t phys = page_to_phys(page) + offset;
+ dma_addr_t dma_addr = phys_to_dma(dev, phys);
+
+ if (unlikely(swiotlb_force == SWIOTLB_FORCE))
+ return swiotlb_map(dev, phys, size, dir, attrs);
+
+ if (unlikely(!dma_capable(dev, dma_addr, size, true))) {
+ if (swiotlb_force != SWIOTLB_NO_FORCE)
+ return swiotlb_map(dev, phys, size, dir, attrs);
+
+ dev_WARN_ONCE(dev, 1,
+ "DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n",
+ &dma_addr, size, *dev->dma_mask, dev->bus_dma_limit);
+ return DMA_MAPPING_ERROR;
+ }
+
+ if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ arch_sync_dma_for_device(phys, size, dir);
+ return dma_addr;
}
-#endif
-size_t dma_direct_max_mapping_size(struct device *dev);
+static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,
+ size_t size, enum dma_data_direction dir, unsigned long attrs)
+{
+ phys_addr_t phys = dma_to_phys(dev, addr);
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ dma_direct_sync_single_for_cpu(dev, addr, size, dir);
+
+ if (unlikely(is_swiotlb_buffer(phys)))
+ swiotlb_tbl_unmap_single(dev, phys, size, size, dir, attrs);
+}
#endif /* _LINUX_DMA_DIRECT_H */